Dominic Stone
Muscles are organs that contain cells that can contract, allowing them to generate force and movement. They do this by contracting and then relaxing, which is made possible by the sarcomere, found in all muscle cells. The sarcomere contains a motor protein called myosin, which powers the muscle to contract by 'grabbing' onto another protein called actin and 'flexing'. When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
| Characteristics | Values |
|---|---|
| How muscles create movement | Muscles move our bodies by contracting and then relaxing |
| They generate force and movement | |
| They use energy from our food to produce movement | |
| They need signals from our brains to contract and move | |
| They are composed of cells collectively referred to as muscle fibres | |
| Each muscle fibre is multinucleated with its nuclei located along the periphery of the fibre | |
| The cerebellum coordinates the muscle movements ordered by the motor cortex | |
| Sensors in the muscles and joints send messages back through peripheral nerves to tell the cerebellum and other parts of the brain where and how the arm or leg is moving and what position it's in | |
| Striated muscles receive their triggers from the brain via motor neurons | |
| Calcium is the key molecular messenger in the process | |
| The foundation for muscle contraction is the sarcomere, found in all muscle cells | |
| Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by “grabbing” onto another protein called actin and “flexing |
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What You'll Learn
- Muscles contract to generate movement
- Smooth muscle movement is more gradual than striated muscle movement
- Skeletal muscle works with the bones of the skeleton to create body movements
- Muscles need signals from the brain to contract and move
- The cerebellum coordinates the muscle movements ordered by the motor cortex
Muscles contract to generate movement
The cerebellum coordinates the muscle movements ordered by the motor cortex. Sensors in the muscles and joints send messages back through peripheral nerves to tell the cerebellum and other parts of the brain where and how the arm or leg is moving and what position it's in. This feedback results in smooth, coordinated motion.
Muscles allow us to consciously move our limbs, jump in the air, and chew our food. But they are also responsible for many more processes that we cannot actively control, such as keeping our hearts pumping, moving food through our guts, and even making us blush.
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Smooth muscle movement is more gradual than striated muscle movement
Muscles create movement by contracting and relaxing. They use energy from food to produce movement. Skeletal muscle works in conjunction with the bones of the skeleton to create body movements. Smooth muscles do not have striations and we cannot actively control what they do. The contractions that smooth muscles produce tend to be more gradual than those produced by striated muscle. For example, the slow and controlled movement of food through the digestive system is caused by smooth muscle.
The cerebellum coordinates the muscle movements ordered by the motor cortex. Sensors in the muscles and joints send messages back through peripheral nerves to tell the cerebellum and other parts of the brain where and how the arm or leg is moving and what position it's in. This feedback results in smooth, coordinated motion. If you want to lift your arm, your brain sends a message to the muscles in your arm and you move it. When you run, the messages to the brain are more involved, because many muscles have to work in rhythm.
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Skeletal muscle works with the bones of the skeleton to create body movements
Muscles create movement by contracting and relaxing. The foundation for muscle contraction is the sarcomere, found in all muscle cells. Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by “grabbing” onto another protein called actin and “flexing”. When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
Skeletal muscle works in conjunction with the bones of the skeleton to create body movements. Skeletal muscle is composed of cells collectively referred to as muscle fibres. Each muscle fibre is multinucleated with its nuclei located along the periphery of the fibre. Skeletal muscle is associated with the diaphragmatic, esophageal, and eye muscles. It serves a variety of purposes, including moving the body, breathing, and swallowing. In contrast to smooth muscle and cardiac muscle, skeletal muscle contracts primarily in response to a voluntary stimulus.
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Muscles need signals from the brain to contract and move
The principal functionality of muscle is rooted in its ability to contract and relax. The foundation for muscle contraction is the sarcomere, found in all muscle cells. Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by "grabbing" onto another protein called actin and "flexing". When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
Striated muscles receive their triggers from the brain via motor neurons. This results in calcium rushing into the muscle, allowing actin and myosin to spring into action. Smooth muscles, on the other hand, produce more gradual contractions and we cannot actively control what they do. However, both striated and smooth muscles have one thing in common: calcium is the key molecular messenger in the process.
Skeletal muscle works in conjunction with the bones of the skeleton to create body movements. It also serves a variety of other purposes, including breathing and swallowing.
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The cerebellum coordinates the muscle movements ordered by the motor cortex
Muscles are organs that contain cells that can contract, allowing them to generate force and movement. Skeletal muscle, for example, works in conjunction with the bones of the skeleton to create body movements.
Muscles move body parts by contracting and then relaxing. The foundation for muscle contraction is the sarcomere, found in all muscle cells. Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by “grabbing” onto another protein called actin and “flexing.”. When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
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Frequently asked questions
Muscles create movement by contracting and relaxing.
The foundation for muscle contraction is the sarcomere, found in all muscle cells. Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by “grabbing” onto another protein called actin and “flexing”. When the myosin releases the actin, the muscle relaxes.
Muscles allow us to consciously move our limbs, jump in the air, and chew our food. They are also responsible for many more processes that we cannot actively control, such as keeping our hearts pumping, moving food through our guts, and even making us blush.
